Insights

Startup Acceleration 4xxi specializes in launching startups and delivering products that transform industries, suggesting a strong fit for early-stage ventures needing end-to-end development, AI/ML solutions, and scalable backend/front-end capabilities.

Global Experience With 12+ years in multiple markets (US, UK, VG, Asia, Europe) and a London HQ, 4xxi can position itself as a globally experienced partner, appealing to international clients seeking cross-border delivery and local presence.

Proven Outcomes Having completed over 100 projects and contributing to clients that raised $500M+, there is evidence of delivering value and potential for ROI-focused engagements, including performance-based or long-term retainers.

Thought Leadership Media exposure in TechCrunch, Forbes, Business Insider, NY Times, and Wired enhances credibility for outreach campaigns, enabling higher confidence outreach to potential clients and partnerships.

Growth & Partnerships Active startup competitions in London with major partners (WeWork, Barclays, F6S, 11FS, VCs) indicate an opportunity to co-create programs, accelerators, or joint ventures to access deal flow and brand exposure.

4xxi Tech Stack

4xxi uses 8 technology products and services including HubSpot Analytics, Unpkg, Cloudflare, and more. Explore 4xxi's tech stack below.

  • HubSpot Analytics
    Analytics
  • Unpkg
    Content Delivery Network
  • Cloudflare
    Content Management System
  • Open Graph
    Content Management System
  • HubSpot
    Marketing Automation
  • Astro
    Page Builders
  • reCAPTCHA
    Security
  • Facebook
    Widgets

Media & News

4xxi's Email Address Formats

4xxi uses at least 1 format(s):
4xxi Email FormatsExamplePercentage
FLast@4xxi.comJDoe@4xxi.com
71%
FL@4xxi.comJD@4xxi.com
17%
Last@4xxi.comDoe@4xxi.com
8%
LF@4xxi.comDJ@4xxi.com
4%

Frequently Asked Questions

What is 4xxi's official website and social media links?

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4xxi's official website is 4xxi.com and has social profiles on LinkedIn.

What is 4xxi's NAICS code?

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4xxi's NAICS code is 5415 - Computer Systems Design and Related Services.

How many employees does 4xxi have currently?

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As of July 2026, 4xxi has approximately 22 employees across 3 continents, including EuropeAsiaNorth America. Key team members include Ceo: E. T.Chief Product Officer: E. S.Founder: E. S.. Explore 4xxi's employee directory with LeadIQ.

What industry does 4xxi belong to?

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4xxi operates in the IT Services and IT Consulting industry.

What technology does 4xxi use?

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4xxi's tech stack includes HubSpot AnalyticsUnpkgCloudflareOpen GraphHubSpotAstroreCAPTCHAFacebook.

What is 4xxi's email format?

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4xxi's email format typically follows the pattern of FLast@4xxi.com. Find more 4xxi email formats with LeadIQ.

When was 4xxi founded?

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4xxi was founded in 2008.
4xxi logo

4xxi

IT Services and IT ConsultingEngland, United Kingdom11-50 Employees

4xxi is a London-based IT services and consulting firm that focuses on helping startups launch and develop products that transform industries. The company emphasizes creating products that genuinely make a difference, drawing on more than 15 years of experience across a range of notable projects. Its service offerings include backend development, frontend development, DevOps, AI/ML solutions, and mobile development.

Headquartered in London, the firm has operated in global markets for more than 12 years, including the United States, the Virgin Islands, Asia, and Eastern and Western Europe, and has completed over 100 projects. Its client base comprises startups and other ventures seeking engineering and product development support, and it runs startup competitions in London through partnerships with organizations such as WeWork, Barclays, F6S, 11FS, Capital Enterprise, and venture-capital firms.

Section iconCompany Overview

Website
4xxi.com
NAICS Code
5415 - Computer Systems Design and Related Services
Founded
2008
Employees
11-50

Section iconMedia & News

Section iconFunding & Financials

  • $1B$10B

    4xxi's revenue is estimated to be in the range of $1B$10B

Section iconFunding & Financials

  • $1B$10B

    4xxi's revenue is estimated to be in the range of $1B$10B

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